On Mon, Dec 03, 2012 at 11:14:38AM +0800, Bob Liu wrote: > On Fri, Nov 30, 2012 at 11:03 PM, Kirill A. Shutemov > <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > > From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> > > > > Don't forget to account newly allocated page in fallback path for > > copy-on-write of huge zero page. > > > > What about fallback path in do_huge_pmd_wp_page_fallback()? > I think we should also account newly allocated page in it. No. Normal huge pages has already accounted on fork(). See copy_huge_pmd(). Huge zero page (as 4k zero page) doesn't contribute to RSS, so we need to account the page which replaces huge zero page on COW. -- Kirill A. Shutemov
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